https://doi.org/10.1007/s100510050770
Non-Lorentzian spectral functions for Coulomb quantum kinetics
1
Universität Rostock, FB Physik, Universitätsplatz 3, 18051 Rostock, Germany
2
Institut für Theoretische Physik, Universität Frankfurt, Robert-Mayer Strasse 8-10,
60054 Frankfurt, Germany
Received:
7
August
1998
Published online: 15 May 1999
Numerical solutions of the Kadanoff-Baym equations
with self-energies in second Born approximation are presented for electrons
in a bulk semiconductor. The results
are used to analyze in detail the two-time spectral function
.
In particular,
(I) the damping of the spectral function is investigated over a broad
density range both, for low and high temperatures;
(II), is compared to analytical expressions -an
exponential and a recently proposed inverse hyperbolic cosine decay law;
(III), the two analytical spectral functions are studied with respect to
conservation of total energy, where for the inverse hyperbolic cosine an
improved behavior is demonstrated.
PACS: 05.20.Dd – Kinetic theory / 05.30.-d – Quantum statistical mechanics
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 1999
